Tag: substances and objects

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Questions Related to substances and objects

Multiple choice biology substances in daily use can all changes be reversed? substances and objects changes around us

The most fibre are chemically composed of non-starch polysaccharides.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The most fibre are chemically composed of non-starch polysaccharides like cellulose, inulin, lignin, chitins, pectins, oligosaccharides. They are either obtained from plants or animals. They are either soluble or insoluble. 

Multiple choice evs substances in daily use can all changes be reversed? substances and objects changes around us

Human life require which kind of material for leaving?

  1. Food

  2. Fuel

  3. Home

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Food is something that provides nutrients. 

Nutrients are substances that provide: energy for activity, growth, and all functions of the body such as breathing, digesting food, and keeping warm; materials for the growth and repair of the body, and for keeping the immune system healthy.

Fossil fuels are used to fuel cars and aeroplanes, power electricity plants, and heat our homes. 

They are also used to make medicines, cosmetics, plastics, synthetic fabrics, and lubricants. When you brushed your teeth today, you used a product made from oil – toothpaste.

We need a home as it gives shelter and security.

Hence the option D is correct.

Multiple choice evs substances in daily use can all changes be reversed? substances and objects changes around us

Coal is _________ fuel.

  1. fossil

  2. natural

  3. Both a and b

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Coal is a fossil fuel. Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. 

Multiple choice evs substances in daily use can all changes be reversed? substances and objects changes around us

Petroleum products are used for :

  1. fuel purpose

  2. making creams and ointments
  3. both $A$ and $B$

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Petroleum products such as petrol, diesel, kerosene and petroleum gas are used as fuel as they have high calorific value. 


Petroleum products are also used as raw material for cosmetics industries.

Hence the option C is correct.

Multiple choice chemistry changes around us can all changes be reversed? substances and objects classification of changes

Which of the following changes are irreversible?

  1. Raw egg to boiled egg

  2. Woollen yarn to knitted sweater

  3. Bud to flower

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The following changes are irreversible.We cant covert product into reactant in these processes

1) Raw egg to boiled egg.
2) Woollen yarn to the knitted sweater.
3) Bud to flower.

Multiple choice chemistry changes around us can all changes be reversed? substances and objects classification of changes

Which of the following represents a reversible change?

  1. A metal rod on heating expands (its length increases).

  2. A metal rod on cooling contracts (its length decreases).

  3. Both of the above

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The following represents a reversible change. A metal rod on heating expands (its length increases). A metal rod on cooling contracts (its length decreases).